1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * efs_vh.h
4 *
5 * Copyright (c) 1999 Al Smith
6 *
7 * Portions derived from IRIX header files (c) 1985 MIPS Computer Systems, Inc.
8 */
9
10 #ifndef __EFS_VH_H__
11 #define __EFS_VH_H__
12
13 #define VHMAGIC 0xbe5a941 /* volume header magic number */
14 #define NPARTAB 16 /* 16 unix partitions */
15 #define NVDIR 15 /* max of 15 directory entries */
16 #define BFNAMESIZE 16 /* max 16 chars in boot file name */
17 #define VDNAMESIZE 8
18
19 struct volume_directory {
20 char vd_name[VDNAMESIZE]; /* name */
21 __be32 vd_lbn; /* logical block number */
22 __be32 vd_nbytes; /* file length in bytes */
23 };
24
25 struct partition_table { /* one per logical partition */
26 __be32 pt_nblks; /* # of logical blks in partition */
27 __be32 pt_firstlbn; /* first lbn of partition */
28 __be32 pt_type; /* use of partition */
29 };
30
31 struct volume_header {
32 __be32 vh_magic; /* identifies volume header */
33 __be16 vh_rootpt; /* root partition number */
34 __be16 vh_swappt; /* swap partition number */
35 char vh_bootfile[BFNAMESIZE]; /* name of file to boot */
36 char pad[48]; /* device param space */
37 struct volume_directory vh_vd[NVDIR]; /* other vol hdr contents */
38 struct partition_table vh_pt[NPARTAB]; /* device partition layout */
39 __be32 vh_csum; /* volume header checksum */
40 __be32 vh_fill; /* fill out to 512 bytes */
41 };
42
43 /* partition type sysv is used for EFS format CD-ROM partitions */
44 #define SGI_SYSV 0x05
45 #define SGI_EFS 0x07
46 #define IS_EFS(x) (((x) == SGI_EFS) || ((x) == SGI_SYSV))
47
48 struct pt_types {
49 int pt_type;
50 char *pt_name;
51 };
52
53 #endif /* __EFS_VH_H__ */
54